Crush cookies.,Reserve 1/2 cup for garnishing.,Add melted margarine to crushed cookies and press mixture in bottom of a 9 x 13-inch pan.,Mix cream cheese and powdered sugar, beating well. Fold in 1/2 cup of Cool Whip.,Spread on top of cookie crust. Chill for 30 minutes.,Mix pudding with milk and spread on top of cream cheese mixture.,Chill for 1 hour.,Top with remaining Cool Whip and sprinkle with,1/2 cup,______,crushed cookies.